package com.example.demo;

import android.content.Intent;
import android.content.IntentFilter;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

import java.util.Calendar;

public class MainActivity extends AppCompatActivity implements IOnUpdateListener{
    private TextView tetTime;
    private MyReceiver receiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        receiver = new MyReceiver(MainActivity.this);
        IntentFilter filter =new  IntentFilter();
        filter.addAction(Intent.ACTION_TIME_TICK);
        filter.addAction(Intent.ACTION_TIME_CHANGED);
        filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
        registerReceiver(receiver,filter);

        tetTime = findViewById(R.id.txt_time);
        updateTime();
    }

    public void updateTime() {
        Calendar calendar = Calendar.getInstance();
        int hour = calendar.get(Calendar.HOUR);
        int min = calendar.get(Calendar.MINUTE);
        StringBuffer buffer = new StringBuffer();
        if (hour<10){
            buffer.append("0");
        }

        buffer.append(hour);
        buffer.append("：");

        if (min<10){
            buffer.append("0");
        }
        buffer.append(min);
        tetTime.setText(buffer);
    }

    @Override
    protected void onDestroy() {
        unregisterReceiver(receiver);
        super.onDestroy();
    }
}
